gabrielle giffords was a surprise witness. the nra's chief executive, wayne la pierre, also testified. giffords, who is still recovering two years after being shot in the head in another shooting attack called on congress to act now. >> speaking is difficult but i need to say something important. violence is a big problem. too many children are dying. >> the head of the nra says adding more school security and mental health resources will help curb gun violence. >>> a chicago teenager who performed at president obama's inaugural festivities here in washington was shot and killed near her school. it happened tuesday afternoon in park city. she was with a group of friend standing under an awning to get out of the rain. a gunman ran down the alley, opened fire randomly and took off in a car. >> i just miss her. i'm not worried about where she is going. my heart -- there is a whole section of my heart that is gone. >> they took the light of my life. this guy, whoever it was, the gunman or whatever, i mean, man, you took the light